中天竺舍衛國祇洹寺圖經 2.26

2.26

次西第二院名為書院。大千界中不同文書竝集其中。有大重閣，安置書籍。佛開擊讀，不依其見，為伏俗故。中小銀鼓，石人頭戴。若欲入院，石人舉手向上擊鼓，僧伽藍人即來開戶。其鼓聲者，如人琴音。比丘讀書，鼓聲不絕，自然開解。鼓是弗波提州無施王所造。

Next, the second courtyard to the west is named the Courtyard of Books. The diverse writings of the great trichiliocosm are all collected within it. There is a great multi-tiered pavilion housing the books. The Buddha permitted them to be struck and read, without adopting their views, in order to subdue worldly folk. In the center is a small silver drum, borne upon the head of a stone statue of a man. When one wishes to enter the courtyard, the stone man raises his hand upward to strike the drum, and the monastery attendant promptly comes to open the door. The sound of that drum is like the notes of a person's zither. When a bhikṣu reads the books, the drum's sound does not cease, and he naturally attains understanding. The drum was crafted by King Wushi of Pūrvavideha.